Stencil-duplicating apparatus.



A. B. DICK.

STENCIL DUPLICATIN G APPARATUS.

APPLICATION FILED r1213. 19, 1909.

945,265. Patented Jan. 4, 1910.

ATTORNEYS pressure-roller between which and the pe- ALBERT a. men,

UNITED STATES PATENT OFFICE.

OF LAKE FOREST, ILLINOIS, ASSIGNOR TO A. B. DICK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

STENCIL-DUPLICL'IING APPARATUS.

Specification of Letters Patent. Application filed February 19, 1809. Serial No. 478,856. J J

Patented Jan. 4, 1910.

To all iiihom it misty concern:

Be it known that I ALBERT B. Dion, a citizen of the United States, residing at Lake Forest, in the county ofLake and been heretofore disclosed.- In a paratus of this character, wherein are emp oyed a rotary drum, upon the periphery whereof the stencil-sheet is secured, and an underlying riphery of said drum the impression-sheets "are passed, it is of importance to provide previously been means for predetermining the point upon such impression-sheets at which the printing from the stencil ,will be commenced. Particularly is this true where the machine isused for the 'purpose of filling in blanks upon impression'- sheets upon which have printed letters, forms, etc. In the present inventioni1 by simple and readily-operable means, e exact point upon the impression-sheet at which a lineor character upon thestencil-sheet will be printed can be readily predetermined and provided for. Y

Another object of the invention is to provide a brake or lock for the stencil-carryingi drum, so that the same may either be in immovable position or be made movable with difficulty, when, for example, the stencil is being adjusted. This feature of the in vention is particularly desirable in rotary duplicating apparatus, wherein, either by reason of the-crank or other mechanism or the covering of but a portion of the drum with the stencil-carrier, such drum does not balanceso that it will without special pro-- vision remain at the point at which it is left after the printing operation. This feature of the invention takes the form, in a referred embodiment, of a brake, cooperatng with a part moving with the drum, as,

for instance, one of. the stub-shafts upon which the drum is mounted, to either rigidly secure the same against movement or to retard its movement so that the drum maybe moved onl by design. Thisbrake isconueoteti wi the throw-oif mechanism so .and useful Improvements in Stencil-Duplieating Apparatus,

ed as an frame-members as to be thrownto braking or locking position when such mechanism is operated to throw the pressure-roller of the machine out of operative relation to the drum. It is during such inoperative relation of the (pres sure-roller and the drum that it is esirable to hold the latter against free movement, either when inking the interior of" such drum, or when attaching the stencil, or when adjusting thevarious parts to predeterminethe point at which im ressions will be made upon the impression-s eets, as hereinabove referred to.

-Inthe drawings, in which I have illustrated in detail only sufficient of a standard form of stencil-duplicating machine to enable my invention to be properly described,

Figure l'is a side elevation and Fig. .2 a section on omitted for 'clearness.

Referring to these drawings, it will be seen that the drum, com rising the usual heads A connected by tieare a, a, and the usual foraminated stencil-carrier (not shown), is mounted for rotation in the'upwardly extendingflarms b forming part of the side frame-members B. To one of the heads A is (detachably) secured the pinion C mounted upon a collar 0 carried shaft cfljournaled in a suitable bearin in the upwardly-extending arm 6 of one o the B. Outside such framemember said stub-shaft is provided with an enlarged head or collar 0 The shaft of the pressure-roller D is i 1? '90 naled at its ends in hinged arms d, to who are connected coil-springs d tending to move such roller toward the periphery of the'drum. These hinged arms have wardly and backwardly curved ends d", and with these coact eccentrics d mounted upon a shaft d operated by means of the handpiece d, these parts being commonly termed the f throw-o mechanism, inasmuch as when the hand-piece d is in the position in which it is illustrated in Fig. 1, the pressure- ;roller is locked out of the position 1n which it may coact with the eriphery of the stencil-carryingv drum. hen, on the other hand, thehandiece d in thrown to its other position, the hinged arms d are released and permitted to respond to the upward pressure of the coil-springs d Coacting with the pinion C is a similar,

by a stub-' the line 2-2, certain parts being down although smaller, pinion E, mounted upon stub-shaft e journaled in the upwardly-ex- I tending portion 6 of the frame-member B.

Keyed or otherwise secured to said stubshaft, outside said frame-member, is the crank-arm F, whereby thedrum is rotated.

Duplicating apparatus of the character here described is commonly provided with paper-stops against which the impressionsheets are fed before being imprinted upon through the stencil-sheet. Such stops form ing no part of the present invention are not here illustrated. It may be remarked, however, thatin apparatus now on the market movement of the drum progresses and-the stencil-covered portion of the periphery thereof reaches the point where pressure is exerted by the pressure-roller, the sheet is fed forward by the coaction of said rollerand said drum and simultaneously imprinted upon. In thist pe of apparatus, the moment atywhich the mechanical) feeding of the sheet will commence is determined by the moment at which the'pressure-roller and the stencil-covered periphery of the drum are brought into cooperative relation. To predetermine this moment, and therefore to provide for variation in the point upon an impression-sheet at which a character or other matter appears uponthe stencil-sheet, I provide, in a preferred form of the invention, a sector H loosely mounted upon the stub-shaft 0 and adjustable with relation to the drum head A by suitable means such as the slot k and set-screw h. Said sector is provided with a suitable scale It. which may coact with a fixed point upon the head A, as, for instance, the mark h Carried by the sector H is a cam H the end portions whereof are inclined toward the center of the -drum as shown at it", the cam surface being adapted during the rotation'of the drum to coact with a sheave-I carried by an arm 2' secured to a rock-shaft a" .journaled at its ends in the side-members B of the frame. The ends of the arins z' overlie the hinged roller-carrying arms 03 at about the point atwhich the shaft of said pressure-roller is journaled in said arms 0!. When, therefore, the arms 2' are, through the coaction of the sheave I and cam H, depressed, the pressure-roller is correspondingly depressed and held out of contact with the stencil-covered periphery of the drum. As, however, said cam passes out of engagement with said sheave, the pressureroller is released and, an impression-sheet having previously been placed in the machine, the same is clamped between said pressure-roller and the stencil-covered periphery of the drum, the cooperative movement of these two instrumentalities serving to feed such sheet (the paper-stops above referred, to having meanwhile been thrown to inoperative position) through the machine while at the same time the impression from a stencil-sheet is imprinted thereon. By providing for the adjustment of the sector, the moment at which the (mechanical) feeding of the paper is to begin may be predetermined so as to definitely locate upon' the impression-sheet any character or other matter with which the stencilsheet has been provided.

Referring now to the brake mechanism, this, in the present embodiment of the invention,.takes the form of a brake-member J pivotally mounted upon the stub-shaft e and having at its other end the shoe j coacting with the head or collar a secured to the stub-shaft c which carries the drum.

Said brakemember is provided "with an angular extension j to which is secured a spring j provided at its lower end with a curved portion 7' corresponding with the curvature of the handle of the hand-piece d". When said hand-piece is turned to the position in which it is shown in Fig. 1, it is arrested by contact of the handle thereof with said curved portion j of the spring 7' and in moving to this position the handle coactswith the spring. j so that the brakemember J is rocked upon its pivot e and the shoe 7' brought into contact with the head or collar 0 This contact may be such as to actually lock the drum, or, if desired, such as merely to retard the movement thereof. When the hand-piece d is thrown to its opposite position, at which position the pressure-roller is free to rise under the influence of the springs d, the brake-member J is released, whereupon it is thrown to inoperative position, out of contact with the head or collar 6 This is conveniently done by means of the spring j secured to the brake-member J at one end and at its other end making contact with a part 7' of the bearing in the framemember B, in which the stub-shaft c is mounted.

Having now described my invention, what I claim as new therein and desire to secure by Letters Patent is as follows 1. In duplicating apparatus, the combination of side-frames, a drum pivotally mounted thereon, an underlying pressureroller movableto operative and inoperative positions, asector pivoted on one of the pivots of said drum, means for securing said sector to said drum in various positions about its pivotal axis, said sector hav-v ing a cam surface on the outer edge thereof inclined at both ends thereof toward the center of the drum, cooperatin mechanism between said sector and said ro er for movmg the latter, a gear secured to the drum in ependently of said sector, and means coacting with said gear for rotating the drum, substantially as set forth.

2. In duplicating apparatus, the combination of a rotary drum, 9. pressure-roller, means for moving the pressure-roller toward and away from the drum to operative and inoperative positions, throw-off mechanism for said pressure-roller, and a brake cooperating with said drum and with said ghrolw-ofi' mechanism, substantially as set ort 3. In duplicating apparatus, the combi-- nation of a rotary drum, a pressure-roller,

mechspect thereto by means of said throw-off mechanism, substantially as set forth.

4. In duplicating apparatus, the combination with a drum and an underlying pressure-roller, of throw-ofi' mechanism forsaid pressure-roller, abrake for said drum, and an elastic connection between said brake and said mechanism, substantially as set said brake and a moving part of said throwofi' mechanism for throwing said brake to operative and inoperative positions, sub

stantially as set forth.

This s ecification signed and witnessed this 9th dhy of February, 1909. r

ALBERT B. DICK.

Witnesses:

S. O. EDMONDS, D. J. En monos. 

